There could be several reasons why your Pulsar 180 is giving you less mileage all of a sudden. Here are a few potential causes to consider:
Fuel quality: Poor quality or adulterated fuel can negatively affect your bike's mileage. Try refueling from a reputed fuel station to ensure the fuel quality is good.
Tire pressure: Incorrect tire pressure can increase rolling resistance, resulting in decreased fuel efficiency. Check your tire pressure regularly and maintain it according to the manufacturer's recommendations.
Spark plug condition: A worn-out or fouled spark plug can lead to inefficient combustion, resulting in decreased mileage. Consider checking and cleaning/replacing the spark plug if necessary.
Air filter: A clogged or dirty air filter can restrict airflow to the engine, affecting its performance and mileage. Ensure the air filter is clean and replace it if needed.
Chain tension: If the chain is too tight or too loose, it can cause friction and affect the bike's efficiency. Check the chain tension and adjust it as per the manufacturer's recommendations.
Engine tuning: Over time, the engine may require tuning or adjustment to maintain optimal performance. If your bike hasn't been serviced for a while, consider getting it serviced, including carburetor tuning if applicable.
Riding style: Your riding style can also impact fuel efficiency. Aggressive acceleration, frequent braking, and high speeds can consume more fuel. Try adopting a smoother and more fuel-efficient riding style.
If the issue persists despite checking these factors, it's advisable to take your bike to an authorized service center or a qualified mechanic. They can diagnose the problem more accurately and provide appropriate solutions.